From Coffee Cup to Trading Floor: Jonathan's and the Birth of the Stock Exchange

A coffeehouse on Change Alley

Around 1680, a merchant named Jonathan Miles opened a coffeehouse in Change Alley, a narrow lane wedged between Cornhill and Lombard Street in the City of London, sometimes also called Exchange Alley. Nothing marked it out from London's hundreds of other coffee rooms at first. What made it different, within little more than a decade, was who came to sit in it. By 1694, Jonathan's had become one of a handful of coffeehouses where a person could reliably find a stockbroker and get a current share price, a service no formal institution in the City yet offered in the open.

The City in the 1690s was not short of places to do business. The Royal Exchange stood a few hundred yards away as the established seat of London commerce, a chartered building with a merchant class that policed its own floor. A coffeehouse carried no charter and no guild membership. It asked only the price of a coffee at the door, and it let a broker, a peer, a widow with money to invest, and a stranger new to London sit at the same table and talk business. That informality is what let a market grow inside it that no chartered institution had built on purpose.

What the coffeehouse substituted for was personal connection. Buying a share in a trading company had depended, until then, on knowing the right people. A room where prices circulated by word of mouth, and soon in print, offered something closer to a public market than a private one. That substitution, from connection to information, is the thread the rest of this history follows.

Pushed out of the Royal Exchange

The stockjobbers, as dealers in stocks and shares were called, did not choose Jonathan's out of preference alone. Around 1697 and 1698, the merchants who ran the Royal Exchange forced the issue. They disapproved of speculative trading in company shares, a business they considered closer to gambling than to the trade in goods the Exchange had been built for, and they pushed the jobbers off the floor. The dealers relocated into Change Alley's coffeehouses, and Jonathan's became their de facto trading floor.

The eviction is worth pausing on, because it marks a real transfer of financial power, more than a simple change of address. The Royal Exchange was a chartered institution: its standing came from the Crown and from a merchant establishment that could set the terms of who traded there and how. Jonathan's had no such standing. It was a private business selling coffee, and the market that grew inside it answered to no charter and no guild court. The jobbers had been expelled from a controlled space into an open one.

That move set a pattern that recurs through Britain's financial history: a chartered institution rejects a new kind of trading as too risky or too disreputable, and the trading moves into an unregulated space instead, where it grows on its own terms until it is too large to ignore. London's stock market began that way, outside the walls of the institution that might have been expected to house it.

The distinction mattered beyond the alley itself. A market that grew up independent of guild and charter, in the same city as the state's own financial institutions, was a different kind of power than the tightly chartered exchanges of continental Europe. It sat close enough to government finance to help fund it, and separate enough from government control to grow faster than a chartered body would have allowed.

Castaing's Course of the Exchange

The single development that turned Jonathan's from a convenient meeting room into market infrastructure was a piece of paper. John Castaing, a Huguenot refugee who had fled religious persecution in France, began publishing a price list from Jonathan's on 26 March 1697. He called it the Course of the Exchange and issued it twice a week: a running record of the prices at which stocks and commodities were trading.

Before Castaing's list, getting an honest price meant asking someone who already traded, which meant the price a person got depended on who they knew. The list changed the basis of the transaction. A price printed twice a week and available to anyone who could read it did not care whether the reader was a City insider or a stranger just off a ship. It let people trade on public information instead of private connection, which is close to the definition of a functioning market rather than a closed one.

The list also outlived everyone involved in creating it. It is recognized as the direct ancestor of the London Stock Exchange's Daily Official List and is described as the longest continuously published financial periodical in the world, a lineage running for more than three centuries from a handwritten note on a coffeehouse table to the settled record of a modern exchange.

The infrastructure Castaing built was thin by modern standards, two sheets of prices a week, but it did the one thing a market needs that a room full of gossip cannot supply on its own: a shared, checkable record of what things were actually trading for. Everything that followed, both the market's growth and its later collapse, ran through that same room and, largely, through that same kind of publicly circulated price.

The room that broke itself: the South Sea Bubble

The South Sea Company was chartered in 1711 for a specific, unglamorous purpose: to help restructure Britain's national debt, taking on government obligations in exchange for a trading monopoly and the promise of interest paid by the Crown. For most of a decade it was a financial instrument more than a business. Then, in 1720, it became something else.

The company's share price climbed through the early months of 1720 on a speculative run driven substantially by trading and rumor circulating through the Exchange Alley coffeehouses, the same rooms Castaing's list had helped turn into a public market. Word of a coming fortune moved faster than any fact could check it, and the price rose on expectation rather than on anything the company had actually done. When the climb reversed, it reversed just as fast. Thousands of investors, from City financiers down to ordinary savers who had put money in on the strength of the excitement around it, were ruined, and the collapse diminished the wider national economy.

A Parliamentary inquiry that followed found the failure was not simple mania. Company insiders had used advance knowledge of the timing of a debt-consolidation scheme to profit before the public could act on the same information, and large bribes had secured the Parliamentary acts the scheme needed in the first place. It stands as one of the earliest documented cases of insider trading intertwined directly with state finance, the same room that had made public price information the basis of an open market had also made it possible to trade on information that was never public at all, held by people close enough to power to know it first.

The irony sits at the center of the story. The open room and the public price list had let a market of strangers form because information moved beyond personal networks. The Bubble showed what happened when that same open room ran on rumor rather than fact, and when the people closest to the government's own finances could act on facts the room did not yet have.

Britain tries to legislate the coffeehouse out of its own market

Parliament's response came in two waves, both aimed at reining in exactly the kind of open, self-organizing trading that had grown up at Jonathan's. The first, the Bubble Act of 1720, had actually been promoted by the South Sea Company itself earlier that year, before its own collapse, to block rival speculative schemes from competing for investor money. It forbade forming new joint-stock companies without a royal charter, a restriction that constrained British corporate formation for more than a century afterward.

The second wave came fourteen years later. Sir John Barnard's Stock-Jobbing Act received royal assent on 16 April 1734 and took effect on 1 June that year. It outlawed options, futures, and margin trading, the speculative instruments regulators of the day blamed for having fed the Bubble's run-up. Where the Bubble Act had tried to control who could form a company, Barnard's Act tried to control how shares in existing companies could be traded.

Both acts were attempts, in effect, to put a chartered frame back around a market that had grown up specifically because it had escaped one. Neither succeeded in moving the trade back inside a controlled institution. Jonathan's kept its position as London's securities market for decades afterward, and the options and futures trading Barnard's Act tried to ban continued in practice long after 1734, simply conducted with less paperwork. A state can legislate against a form of trading. It has a harder time legislating against the room where people have already learned to do it.

From coffee room to chartered exchange, and the pattern that outlasted it

By 1748, London's securities market was firmly centered on Jonathan's Coffee House in Exchange Alley, its position secure decades before the brokers who traded there took the more formal steps that eventually built a recognizable institution: a subscription-only trading room in 1761, open only to members who paid to enter, and a chartered Stock Exchange in 1801 and 1802. The building came last. The market came first, and it had already been operating in something close to its later form for the better part of a century by the time anyone incorporated it.

That sequence, market before institution, matters for what it says about where financial power actually sat in eighteenth century Britain. The capital raised and traded through Exchange Alley's open rooms helped fund the government's debt, its wars, and its imperial expansion, a state that had never chartered the room where that capital moved. It was close enough to the Crown's finances to matter to them directly, and independent enough of the Crown's institutions to grow at its own pace. Over the following decades, that combination, deep, self-organizing capital markets sitting alongside rather than inside formal state institutions, is a real part of how London's pool of capital eventually grew larger than Amsterdam's, the older and more formally organized exchange that had led European finance through much of the seventeenth century. Historians still weigh how much of that eventual gap to credit to the open coffeehouse market specifically, against Amsterdam's own later troubles and Britain's naval and colonial position, but the timing is suggestive: the open room kept growing for a century while the chartered one aged.

The deeper pattern is one this series returns to across mediums and centuries: whoever controls the record that reaches the public controls a real share of the market itself. Castaing's list decided which prices counted as real enough to trade on, and a price or a rumor that never made it onto that twice-weekly sheet was, for practical purposes, invisible to the strangers doing the trading. The mechanism is different now. It is an AI system deciding which businesses are legible enough to be named in an answer, rather than a broker's list deciding which prices were legible enough to trade on. But the underlying fact, that visibility in the dominant medium of the day is not a courtesy but the actual precondition for being included in the market at all, is the same one Change Alley demonstrated first.